a. Le Châtelier’s principle predicts that the shift will be away from the substance whose concentration is increased. The equilibrium position will shift to the left when CO is added.b. Since the amount of a pure solid has no effect on the equilibrium position, changing the amount of C or As4O6 will have no effect.c. If gaseous As4 is removed, the equilibrium position will shift to the right to form more products. In industrial processes the desired product is often continuously remove from the reaction system to increase the yield..